636132725849 has 2 divisors, whose sum is σ = 636132725850. Its totient is φ = 636132725848.

The previous prime is 636132725843. The next prime is 636132725897. The reversal of 636132725849 is 948527231636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513795072025 + 122337653824 = 716795^2 + 349768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636132725849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 636132725794 and 636132725803.

It is not a weakly prime, because it can be changed into another prime (636132725843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318066362924 + 318066362925.

It is an arithmetic number, because the mean of its divisors is an integer number (318066362925).

Almost surely, 2^636132725849 is an apocalyptic number.

It is an amenable number.

636132725849 is a deficient number, since it is larger than the sum of its proper divisors (1).

636132725849 is an equidigital number, since it uses as much as digits as its factorization.

636132725849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 56.

The spelling of 636132725849 in words is "six hundred thirty-six billion, one hundred thirty-two million, seven hundred twenty-five thousand, eight hundred forty-nine".